Repair method for T21 BHB68701 hash board only detecting 104 ASIC chips

This specialized repair course addresses partial ASIC detection issues on Antminer T21 BHB68701 hash boards, specifically the common 104, 105, 106, 107 and 108 chips found error. Learn the CI signal shorting method to quickly isolate faulty chips within the BM1368PB chain, starting from chip #59 and progressively narrowing to specific faulty positions. Detailed procedures cover CI signal voltage verification at 1.2V, testing 33-ohm series resistors, and visual inspection for solder defects. The tutorial demonstrates when to reflow chips versus complete replacement and how to systematically progress through the chip chain until all 108 ASICs are detected. This targeted approach efficiently resolves incomplete chip detection in T21 BHB68701 boards, restoring full hashrate capability.

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